Most knee problems develop over time, not just on a random day playing in the backyard with the kids. This is repetitive trauma (think: wear and tear), and any mechanical device (including the knee) will fail with excessive strain. In fact, one in three sports-related injuries occurs at the knee.
Without proper knee mobility other joints and parts of our bodies will suffer as well. Bad knees can cause bad ankles, bad hips, and a bad back, and the same goes in reverse. So it is extremely important to not only keep your knees healthy, but also pay attention to the rest of your body as well. Keeping up with your warm ups and dynamic mobility exercises is important for all joint health. These practices help to control inflammation, distribute joint fluid, develop structures around the joint, and enhance range of motion.